Effect of Different shapes of DGS on Characteristics of Rectangular Microstrip Patch Antenna

The design of Microstrip antennas mainly got focus due to need of multiband, larger gain and low profile antennas to support multiple wireless applications. Main advantage of microstrip antennas is small profile design which enhance their application in the micro communication devices. The overall characteristics of such antennas can be further modified and improved by two techniques: Introducing defect in ground plane and adding layers to the conducting surface. This paper presents the changes in the above characteristics of micostrip patch antenna due to different shapes of defects introduced in the ground plane. The antenna in this presented in this paper is simulated on FR4 substrate with dielectric constant of 4.4 and simulated for results using HFSS software. By changing shapes of the defects the corresponding changes in the characteristics have been noted for 2.4GHz of resonant frequency.